Dawg... I have connected to a single IP (buddies) which is fairly simple...
Disconnect from Gnuttella Network...
Enter the IP of your buddies client in the Favorites at the bottom of the screen or the one on the Right bottom for a quick connect...
I would make that IP the one with the Best/Fastest Internet connection. In theory If all your buddies put your IP in, when you are running PHEX off the GNUT network..you should all connect to you as if you are the UltraPeer...or the "server".

I know the One to one works well..the multiple should be the same..

Good luck!

Rob